ABSTRACT This bibliographical survey analyses the period open to study through historical archives, from the 1947 Marshall Plan to the 1974 Portuguese Democratic Revolution. Until recently, literature on Portugal and European integration was comparatively underdeveloped in relation to other countries of the European Union. Only the published works of the politician José Gonçalo Corrêa d’Oliveira, the diplomat José Calvet Magalhães, and the economist José da Silva Lopes, provided useful starting points for researchers. Fortunately, this has changed in recent years. The research project, “Portugal and the Unification of Europe”, along with other archive-based work, has contributed to a healthier panorama.